Ion storage device
US5120958A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 7, 1991 |
| Grant date | Jun 9, 1992 |
| Priority date | — |
| Expiry date | May 7, 2011 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J49/40
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An ion-storage device has an electrode structure for subjecting ions in a defined region along a path P to an electrostatic retarding field. The electrostatic retarding field is in the form of an electrostatic quadrupole field. Ions enter the defined region at a position P.sub.1 on the path and they exit the defined region at a position P.sub.2, having travelled a distance x.sub.T. Ions are subjected to the electrostatic retarding field during an initial part only of a preset time interval and the velocity of each ion during that part of the preset time interval is related linearly to its separation x from the exit position P.sub.2 by the expression, ##EQU1## where m is the mass of the ion, q is its charge and k is a constant. Ions having the same mass-to-charge ratio (m/q) all exit the field region at the same time during the remaining part of the preset time interval.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.